EN 50054:1998

1 Scope
2 Definitions
3 General requirements
3.1 Introduction
3.2 Construction
3.2.1 General
3.2.2 Indicating devices
3.2.3 Alarm or output functions
3.2.4 Fault signals
3.2.5 Adjustments
3.2.6 Battery-powered apparatus
3.3 Labelling and marking
3.3.1 General
3.3.2 Identification of the calibration gas Group II apparatus
3.4 Instruction manual
4 Test requirements
4.1 Introduction
4.2 General requirements for tests
4.2.1 Samples and sequence of tests
4.2.2 Preparations of apparatus before testing
4.2.3 Mask for calibrations and tests
4.3 Normal conditions for test
4.3.1 General
4.3.2 Test gases
4.3.3 Standard test gas
4.3.4 Flow rate for test gases
4.3.5 Voltage
4.3.6 Ambient temperature
4.3.7 Pressure
4.3.8 Humidity
4.3.9 Stabilization time
4.3.10 Orientation
4.4 Test methods
4.4.1 General
4.4.2 Unpowered storage
4.4.3 Calibration and adjustment
4.4.4 Drift (continuous duty apparatus)
4.4.5 Drift (spot-reading apparatus)
4.4.6 Alarm set point(s)
4.4.7 Temperature
4.4.8 Pressure
4.4.9 Humidity
4.4.10 Air speed
4.4.11 Pumping rate
4.4.12 Orientation
4.4.13 Vibration (applicable to Group I machine-mounted
        apparatus and to Group II fixed and transportable
        apparatus)
4.4.14 Drop test (applicable to portable apparatus and remote
        sensors)
4.4.15 Warm-up time (not applicable to spot-reading apparatus)
4.4.16 Time of response (not applicable to spot-reading
        apparatus)
4.4.17 Minimum time of operation (spot-reading apparatus)
4.4.18 High gas concentrations above the measuring range
4.4.19 Battery capacity
4.4.20 Power supply variations
4.4.21 Power supply interruptions, voltage transients and step
        changes of voltage
4.4.22 Addition of sampling probe
4.4.23 Dust (applicable to Group I apparatus only)
4.4.24 Poisons and other gases
4.4.25 Electromagnetic immunity
5 Field calibration kit
Annexes
A Flammability limits (i.e. LEL and UEL) of some flammable
        gases and vapours
B Determination of time of response
C Breathing and draining devices which form part of a
        flameproof enclosure
D Tests of flameproof enclosures with breathing and
        draining devices
E Additional requirements for crimped ribbon elements of
        breathing and draining devices
F Additional requirements for elements, with
        non-measurable paths, of breathing and draining devices

This European Standard specifies general requirements for construction and testing and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of combustible gas or vapour concentrations with air. The apparatus, or parts thereof, is intended for use in potentially explosive atmospheres and in mines susceptible to firedamp. This European standard is supplemented by the following European Standards, concerning the specific requirements for performance of the various types of apparatus:EN 50055: Performance requirements for Group I apparatus indicating up to 5 % (v/v) methane in air; EN 50056: Performance requirements for Group I apparatus indicating up to 100 % (v/v) methane EN 50057: Performance requirements for Group II apparatus indicating up to 100 % lower explosive limit; EN 50058: Performance requirements for Group II apparatus indicating up to 100 % (v/v) gas- NOTE 1: Group I apparatus indicating up to 100 % (v/v) methane and Group II apparatus indicating up to 100 % (v/v) gas are suitable for use only with the specific gases for which they have been calibrated. NOTE 2: For the purposes of this European Standard the term 'combustible gas' includes combustible vapours but excludes mist and dust, see 3.3 note 1. This European Standard is applicable to combustible gas detection apparatus intended to provide an indication) alarm and/or other output function, the purpose of which is to give a warning of potential explosion hazard and in some cases to initiate automatic or manual protective actions. This European Standard is applicable to apparatus, including the integral sampling systems of aspirated apparatus intended to be used for commercial and industrial safety applications. This European Standard does not apply to external sampling systems, or to apparatus of the laboratory or scientific types, or to apparatus used only for process control purposes